Health coach. iOS developer.
Builder of humane health apps.
I'm Paul Calver, a Precision Nutrition Certified Master Health Coach and an iOS developer with 15 years of experience. I build health apps the way I coach: evidence first, no guilt mechanics, no fake certainty.
Most health apps are built by engineers guessing at behaviour change, or by coaches who can't ship software. I've spent fifteen years doing one and hold five certifications in the other. Everything I ship, and everything I write here, comes from that overlap.
Apps
RYZR
Stop scrolling when you first wake up.
A morning app blocker that locks the apps you choose when your alarm rings. They unlock on your schedule, or sooner once you finish one small First Move. No streaks, and a difficult morning never erases the mornings you completed.
Manifest
We don't create change. We reveal it.
A reflection app that surfaces quiet evidence of change from your own words: perspective and agency instead of habit tracking, gamification or fake certainty.
BODENow
One clear read on your state, before it matters.
A pre-performance state check for high-stakes moments. An explicit Apple Watch reading against your own baseline: one state, one recommended action, honest uncertainty when data is stale.
Also built
On the App Store Oddlings
Small drawings. Big personalities.
Turn children’s drawings into imaginative characters and scenes, add a five-second animation, and keep each creation alongside the original. Made for parents and carers to explore together.
GoodTides
Is the tide right for what you want to do?
A tide assistant for iPhone and Apple Watch. Find activity windows for walks, swims, paddling, rockpooling and fishing, keep the next tide close, and save private Tide Moments with your photo, place and tide details.
Writing
Evidence-first articles on sleep, stress, mornings, behaviour change, and why most health-app mechanics make people worse. Written by me, sourced, and signed. Read the articles →